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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a3a31d7687c11a109b8ef821f3ad2fd670d54442e0516cef740b98f1c69cc9f' 
  AND token = 'HaSy5ZaALB7gtfoSSq3rzHMciL8hEDmC7RnfH/qGaAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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