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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf9fee226094a3c07c00d41cd69b12fb66122fb82cef3bec8c2b2e84178ee7d' 
  AND token = 'tWI2AcfwAfExlIJcXYaC+LYtkA18N3cveWdi1g9QXuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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