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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1229d2d72bc20fbbfed249067c59f8b07f88d34c4728583ccb35f15e31faa8b2' 
  AND token = 'RH4t06iybjlWKlqDZb1c/YInfCf9LRln4YSj4AAmOhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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