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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ef755330e013c54901b2110bf9b2e48bbad3344c9cd5b534c8d08116d18553' 
  AND token = '+jLerv6P4Gou/yp4oYLGbX29NfvLwIyQAwjkcH8AqUM=' 
  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"
    }
  }
}