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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f2ae12d8a3ffb7fc0b1d45f2ce1da97e28ba57e446dbbab2b84b7685696dc6' 
  AND token = 'iBnj5YoBLSIFRfJxm5UuuTC+dCF2rwADQO0d09RzSn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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