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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1a764264e9f5799636f9150b2f84d6f8bb89d9cd16e57641d9f3efafbc5a5f' 
  AND token = 'URcWnsOjT20JEisXJ4p1i029i1wZODQeuP671DtSYYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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