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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5febe6235b1ee24b42de4d8365fe356ee9915ddcb53e11d4ac7284019fb574' 
  AND token = 'W7zNn4PWy1o/Ue64tYwPoYYukgaQ3glJpTK0v9KQan0=' 
  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"
    }
  }
}