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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0286f7d1b19a16094793b4bb10e604b8b30c287a512b75e380f121966a39300' 
  AND token = 'A+s0TC8rvLX83Wn/+GE6qbQH9zrDix+NsSJjnkhkWBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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