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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd47ee0e4c606776c9fed8817f538cebc94cabbcdd76a709fd0bfb5deec7f4c04' 
  AND token = 'BISJ1GrYbML1OvppOX67vZodnwvk2S5B4UaLRhBojvU=' 
  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"
    }
  }
}