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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a50f35b4d6b8eed6f386349aa40c8287eec00add9c1c260ec31ba828a1fc00e' 
  AND token = '7DsGXErxbPeUpDtDaO5Zu8SAUP3LR7jwoNuNf0wfyMs=' 
  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"
    }
  }
}