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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63859da0a840d6b5e44018c643a977382994d7c3d4900d5a07dd5f5c2ff14794' 
  AND token = 'Q2uz3s8k4gkiQxsNYHTTm7w8R+8sMynmNjiKIGEmj10=' 
  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"
    }
  }
}