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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0a54218574c156d251cb571b38ac76e025e89048df8646e94bc202c5e70cfd' 
  AND token = '99atsSRIdFXLQsc5Prg6147/tQ+jbg0xA6jJbGuIc9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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