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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150aa59f3a29b2cf816381ca2cba335a028fdef471a4209ad62c4ea35fb83f7e' 
  AND token = 'NMhfGT3iIczu5FIwjSOPINWBD7aXYtaoE1IFNhyB/Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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