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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b7d2c4097ab9e839d40d03d66fa4881fd8bc0959b0fbac2b178c5f70be4611' 
  AND token = 'tsFhZqX9hsdxKtXqRdk7iKl3iewt9BG4FxJ6n5Vv43U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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