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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc130e2215abeae1a1b4ae5de833dc56b36610cd9addfb440e1d1df0f86a46ad' 
  AND token = '4LmwKEyjv+gkchQdXZY77v1Ci/Y41kfuXP2FSEH4Rkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}