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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77520d35c45f49f5e2a499d7db33466fb47c7a8538f402baa72c71217436c5c8' 
  AND token = 'HDigtk3mDxqIG7cNjbKeUDOLDRx6nY/iqX5lO62q9DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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