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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb8ad390f7e381776949b11245d76362ec259ba74aeffbf22844ab07dc204b4' 
  AND token = '7cDLOMfXcV8zOqLImsHT8XC6/sPaGasBmL2jfUe/HZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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