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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd72a88d0e600c2fff1801fbc18e1f6ee6508423f8b70a476b613d9e43fb3a1ca' 
  AND token = 'LHDmDIhIZHNQAv5wlqjrt3lqSitQIjcCD81daFvS+Lk=' 
  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"
    }
  }
}