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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56603059735b8091a1f3d6cbb22a5025617298299f39bb57fff6e3a3ef2c1840' 
  AND token = 'GAysJ67wyUF35RF6RO6WCISErTKlpVIeFVsV2gtgFeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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