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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd8c111ca46ce79cd3c363cb791ef04c56a3b16ee06b11aae4562e5710626d2' 
  AND token = 'HVBkgA0+3et4WRuZnaSiHEXSsUrwR2XJrpADc+YLQrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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