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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4568434dbcf384e71487823fc98b09f4e89caf8b0b96247817b2a7c222b40598' 
  AND token = '2EHNH6IfKRQTeL9bx1cwJc8eGzxkAx0H0D5H9n02Gmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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