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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '959b642469a85a0a4802cf4043bd6441abf546eb6b03a139b55e7c3e9bf3b6c0' 
  AND token = '/RDxV8UzFN30nCP3byUmLx34w8EeIK7mGgYriLhPggQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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