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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa72dc1d665e913bc70135f5eb079f27fbf1977d2101b99e9f2c4fdcf6a35e93' 
  AND token = '8nad8F6cx92NlitufMmQnLGh/Eg19mQoYiyec4Bmuqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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