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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d991c27ca0feae87483cf615c7e57190d7f06612a62175d4cf0f03f8e03ebb' 
  AND token = 'Z9YvRuh1lr+oVRrDMTLII3nfDFm4MOu/9e8/dj1d8EA=' 
  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"
    }
  }
}