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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e305f3414073422871781c24d97540ed93aff7cd8ec9ab85773f52bb40dab945' 
  AND token = 'WqH5J4pteUdeNtex7RoQqw/5gz0y6bFfMeZmTtvRuOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00153

JSON explain

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