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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fa48571a58682215d5a619aa7407ac279af05bba71f8f110bd8d5fb9ccf84c' 
  AND token = '7Sc+0ul0UA2m4TcTTjSX9atRmv3zkHDl4xGfzsTVkBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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