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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10004f59877276a3dac357f7b47d9d0564975d471cf7289f8d1749d6b102a58b' 
  AND token = '/nBAkNibOkHfE4IygerP6oewSXmwaVenvVNqk1IGli4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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