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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd44dad3d87a27a9066299d161111ab6ae90c2fe8af9904dbb5d68f3cd4b11f2' 
  AND token = 'sw+xeRuy/0y3pMxsol2Q97d/HUTxvnxnGNXvxySSxJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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