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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e6535f95b08efd93630ddf66f689d2f46eab3c9971c957adf17ff1b8f0d989' 
  AND token = 'IxI1w7U2/JEp/rSf7lI2GTH69bz38SJW2zUMLKAcZvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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