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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99a449db6143f069b472195954d87a7b38e4c3b6cdc9ac60896b68f1d6e3eca' 
  AND token = 'TLnEomioRbTJUhXWYczNbW5hXKzMxE5CWkUwghTEVi8=' 
  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"
    }
  }
}