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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b979d15bf1350b300f519c9eeabe0988716dd91e19fac306daba208bc60d211f' 
  AND token = 'HlDX4aQ2ybHlpAHMtXuUURUUgiTHu7LDnbuxS3U8PVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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