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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6413bad0e85e4ee51223116509557b9d96fa416d850de9bc40a3afde41c3279' 
  AND token = 'gmjQ1iuoNBkV0dd0F3dN4MtsZ7SwRm7trsVPkz/9I6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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