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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd78f58b4669d7f4230e5dcd7dcaef41aa9ff0c224119b546e626729c1834b8' 
  AND token = 'H6SnpCPx+AIiX98CD+/x0DS4k7Ml9VZzlC6XXUVmmyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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