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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '160512d9ed0f7d2a1781199d3842dd09720d1b181a968e179a9b0cde2abd3fad' 
  AND token = '5fuu0VX7DF7I7napBHOlgeP5dHyo3al8hdYYvenN2+M=' 
  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"
    }
  }
}