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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd959ebeba7f6236d4cefc5e2a6ba1c516f222918f7e2f453dd8416a3b3de8b7' 
  AND token = 'A8DZOSbYK9SdQ6xPC3CFl6aAgQVTjUXz2Kp+ySmcVS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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