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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f2a1f28c7a93b3ff6ebbdba1b5eb1498039ac21ccde5be05c73d2bd068e8e7' 
  AND token = 'g9IouJZVw39Jeu2TqiSKy7VcHsffN4TRYtwcV53gG0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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