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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6831e1a751b004365b9f343e3dac6685c7263c35c5707778dbe308fb447dae8' 
  AND token = 'zS9878OG6bbMEIZWbDvQNMna7JpbR/U3sNABSoxj4Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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