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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72bce5816149c1ce3891ec6a75c0ee39d8e9b46047959b51cffd5d2865da9f9c' 
  AND token = '/GwDi8IClb4elMcxSNEghMmR85zmyh49VqKDyAR72Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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