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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77b18d0c7b7bc5a85f44a2dcb24d7d679bacb4138b4d92909977945ce17a781' 
  AND token = '8c9LNk9znIx3i2jrrhiaQqf26Y0J7HN+LGLrx0v2U8I=' 
  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"
    }
  }
}