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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56245d4989bdc27ba715983ecaa8cd136d2b7f5be1b7946b14c83fc1c0be1422' 
  AND token = 'QAQVOyqpG/kGqNflGHog1BfMfn9mb1HipRmPi+72DSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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