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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1ec8bc5a8e0f3bac749bec15bb61b328de95e0fc7c3a9d87e13005ed589068b' 
  AND token = 'oIp3opRzjc4RLBSS9+Ay5VJwusXiGGbchETtuwaa6WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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