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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4176490a8a95a6bc2fcf9b2a2c205cea76d66b08c76b8ca0ffbd68dda8549fc8' 
  AND token = '5Bz6JkUebt0jJWyBcsRjexE6l4X7pzCiISzlM7rk1Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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