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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b54bdf94b0349198b39dd417b7f42dc19446c48028f176fde26ac3dce20d896' 
  AND token = 'lNJtHhF1uMxi9W4TdcNedQLJ0GqaVd3JMSHsS6qNlaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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