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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2faf6f3152096214037d554486c0840a92fdc5728f0c1c9674d89c33ad602eb8' 
  AND token = 'ei0ueIDHVjODKxUq681hADk/cwG44K/y6wlfWjfxeC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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