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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0df98a0fe91750f62a1bb2c6e1fb49033d80d4ccb63134e78d33c98abc9bd099' 
  AND token = 'vvn+ZuQvB1TxSj9Q70tlyU+EdxCLoB1GnRPaSe/KWyo=' 
  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"
    }
  }
}