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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27fce81a2e2350340bdd24a708c4a9d925f77cab15b6ae1522095f507b333cf2' 
  AND token = '0d0YCZIwc0vQA2CJ4LR0m6XTFHRFtQj40HOTOxXW+qM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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